president obama. they identify him as paul kevin curtis of mississippi. he was tied to the letters with his infamous signoff i'm k.c. and i approve this message which is apparently how he signs blog posts. >>> and investigators say they have spot add suspect in monday's bombing for the boston marathon from reviewing security video to department store, though. and this is important, no arrests have been made. and this comes as president obama is heading to boston today to attend a memorial service for the bombing victims. scott cohen is in boston with the latest. he rejoins us now. scott, i understand mitt romney, as well, may be there. what kinds of security measures are taking place? >> well, there remains heavy security in and around boston, kelly, in light of what happened this week. and, obviously, ahead of this visit. i should point out there is not a suspect as far as the authorities are concerned. certainly someone they are interested in talking to. you know, there is an interesting attitude he